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The crystal structure of Cs 2 CuBr 4 is the same as that of Cs 2 CuCl 4 , which has been characterized as a spin-1 2 quasi-two-dimensional frustrated system. The magnetic properties of Cs 2 CuBr 4 were investigated by magnetization and specific heat measurements. The phase transition at zero magnetic field was detected at T N = 1.4 K. It was observed that the magnetization curve has a plateau at about one-third of the saturation magnetization for magnetic field H parallel to the b-and c-axes, while no plateau was observed for H a. The field-induced phase transition to the plateau state appears to be of the first order. The mechanism leading to the magnetization plateau is discussed.
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Tanaka et al. (2002) studied this question.